private async Task ProcessWithDiskCache(HttpContext context, string cacheKey, ImageJobInfo info)
{
var cacheResult = await diskCache.GetOrCreate(cacheKey, info.EstimatedFileExtension, async (stream) =>
{
if (info.HasParams)
{
logger?.LogInformation("DiskCache Miss: Processing image {VirtualPath}{QueryString}", info.FinalVirtualPath, info);
var result = await info.ProcessUncached();
if (result.ResultBytes.Array == null)
{
throw new InvalidOperationException("Image job returned zero bytes.");
}
await stream.WriteAsync(result.ResultBytes.Array, result.ResultBytes.Offset,
result.ResultBytes.Count,
CancellationToken.None);
await stream.FlushAsync();
}
else
{
logger?.LogInformation("DiskCache Miss: Proxying image {VirtualPath}", info.FinalVirtualPath);
await info.CopyPrimaryBlobToAsync(stream);
}
});
if (cacheResult.Result == CacheQueryResult.Miss)
{
GlobalPerf.Singleton.IncrementCounter("diskcache_miss");
}
else if (cacheResult.Result == CacheQueryResult.Hit)
{
GlobalPerf.Singleton.IncrementCounter("diskcache_hit");
}
else if (cacheResult.Result == CacheQueryResult.Failed)
{
GlobalPerf.Singleton.IncrementCounter("diskcache_timeout");
}
// Note that using estimated file extension instead of parsing magic bytes will lead to incorrect content-type
// values when the source file has a mismatched extension.
if (cacheResult.Data != null)
{
if (cacheResult.Data.Length < 1)
{
throw new InvalidOperationException("DiskCache returned cache entry with zero bytes");
}
SetCachingHeaders(context, cacheKey);
await MagicBytes.ProxyToStream(cacheResult.Data, context.Response);
}
else
{
logger?.LogInformation("Serving {0}?{1} from disk cache {2}", info.FinalVirtualPath, info.CommandString, cacheResult.RelativePath);
await ServeFileFromDisk(context, cacheResult.PhysicalPath, cacheKey);
}
}
private async Task ProcessWithDiskCache(HttpContext context, string cacheKey, ImageJobInfo info)
{
var cacheResult = await diskCache.GetOrCreate(cacheKey, info.EstimatedFileExtension, async (stream) =>
{
if (info.HasParams)
{
logger?.LogInformation($"DiskCache Miss: Processing image {info.FinalVirtualPath}?{info}");
var result = await info.ProcessUncached();
await stream.WriteAsync(result.ResultBytes.Array, result.ResultBytes.Offset,
result.ResultBytes.Count,
CancellationToken.None);
await stream.FlushAsync();
}
else
{
logger?.LogInformation($"DiskCache Miss: Proxying image {info.FinalVirtualPath}");
await info.CopyPrimaryBlobToAsync(stream);
}
});
// Note that using estimated file extension instead of parsing magic bytes will lead to incorrect content-type
// values when the source file has a mismatched extension.
if (cacheResult.Data != null)
{
if (cacheResult.Data.Length < 1)
{
throw new InvalidOperationException("DiskCache returned cache entry with zero bytes");
}
context.Response.ContentType = PathHelpers.ContentTypeForImageExtension(info.EstimatedFileExtension);
context.Response.ContentLength = cacheResult.Data.Length; //ReadOnlyMemoryStream, so it supports seeking
SetCachingHeaders(context, cacheKey);
await cacheResult.Data.CopyToAsync(context.Response.Body);
}
else
{
logger?.LogInformation("Serving {0}?{1} from disk cache {2}", info.FinalVirtualPath, info.CommandString, cacheResult.RelativePath);
await ServeFileFromDisk(context, cacheResult.PhysicalPath, cacheKey,
PathHelpers.ContentTypeForImageExtension(info.EstimatedFileExtension));
}
}
